---
id: CVE-2025-59718
title: >-
  A improper verification of cryptographic signature vulnerability in Fortinet
  FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0
  through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3,
  FortiProxy…
summary: >-
  A improper verification of cryptographic signature vulnerability in Fortinet
  FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0
  through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3,
  FortiProxy…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C'
cvssSource: cna
cwe:
  - CWE-347
vendor: Fortinet
product: FortiSwitchManager
affected:
  - FortiSwitchManager >= 7.2.0 <= 7.2.6
  - FortiSwitchManager >= 7.0.0 <= 7.0.5
  - FortiOS >= 7.6.0 <= 7.6.3
  - FortiOS >= 7.4.0 <= 7.4.8
  - FortiOS >= 7.2.0 <= 7.2.11
  - FortiOS >= 7.0.0 <= 7.0.17
  - FortiProxy >= 7.6.0 <= 7.6.3
  - FortiProxy >= 7.4.0 <= 7.4.10
  - FortiProxy >= 7.2.0 <= 7.2.14
  - FortiProxy >= 7.0.0 <= 7.0.21
ssvc:
  exploitation: active
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2025-12-17T04:55:21.365957Z'
exploited: true
exploitAvailable: true
published: '2025-12-09'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:09:26.767Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-59718'
references:
  - url: 'https://fortiguard.fortinet.com/psirt/FG-IR-25-647'
    label: 'https://fortiguard.fortinet.com/psirt/FG-IR-25-647'
tags:
  - cve.org
  - in-the-wild
  - exploit-available
  - kev
epss: 0.68293
epssPercentile: 0.99325
kev: true
kevDateAdded: '2025-12-16'
kevDueDate: '2025-12-23'
kevRansomware: false
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/exfil0/CVE-2025-59718-PoC'
    - 'https://github.com/moften/CVE-2025-59718-Fortinet-Poc'
  checkedAt: '2026-10-15T05:53:20.622Z'
ingestedAt: '2026-10-15T05:52:46.067Z'
---

## Overview

A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

## Affected

- `FortiSwitchManager >= 7.2.0 <= 7.2.6`
- `FortiSwitchManager >= 7.0.0 <= 7.0.5`
- `FortiOS >= 7.6.0 <= 7.6.3`
- `FortiOS >= 7.4.0 <= 7.4.8`
- `FortiOS >= 7.2.0 <= 7.2.11`
- `FortiOS >= 7.0.0 <= 7.0.17`
- `FortiProxy >= 7.6.0 <= 7.6.3`
- `FortiProxy >= 7.4.0 <= 7.4.10`
- `FortiProxy >= 7.2.0 <= 7.2.14`
- `FortiProxy >= 7.0.0 <= 7.0.21`

## Remediation

Upgrade to FortiSwitchManager version 7.2.7 or above
Upgrade to FortiSwitchManager version 7.0.6 or above
Upgrade to FortiProxy version 7.6.4 or above
Upgrade to FortiProxy version 7.4.11 or above
Upgrade to FortiProxy version 7.2.15 or above
Upgrade to FortiProxy version 7.0.22 or above
Upgrade to FortiOS version 7.6.4 or above
Upgrade to FortiOS version 7.4.9 or above
Upgrade to FortiOS version 7.2.12 or above
Upgrade to FortiOS version 7.0.18 or above
Upgrade to FortiWeb version 8.0.1 or above
Upgrade to FortiWeb version 7.6.5 or above
Upgrade to FortiWeb version 7.4.10 or above
Fortinet remediated this issue in FortiSASE version 25.3.b and hence customers do not need to perform any action.
Upgrade to FortiPAM version 1.8.0 or above